Tooth for excavating-shovels.



PATENTED MAY 19, 1908.

F. J. THOMAS.

TOOTH FOR BXGAVATING SHOVELS.

APPLIGATION IILEDAPR. 5.1907.

am n m M w A Z [VIZ/2661965:

FRANK J. THOMAS, OF GREEN CASTLE, INDIANA, ASSTGNOR TO TAYLOR IRON dz STEEL (M- PANY, OF HIGH BRIDGE, NEW JERSEY, A OORPGRATION OF NEW JERSEY.

No. sszeee.

Specification of Letters Patent.

Patented May 19, 1998.,

Application filed April 5, 1907. Serial Qlo. 365,520.

To all whom it may concern:

Be it known that l, FRANK J. THOMAS, a citizen of the United States, residing in Greencastle, in the county of Putnam and State of Indiana, have invented certain new and useful Improvements in Teeth for EX- cavatin -Shovels, of which the following is a specification.

This invention relates to teeth for excavating buckets or shovels, the object of the invention being to provide an improved twopart tooth in which the detachable point is reversible so that when it has worn away and become blunt through use it may be reversed and do efficient work without the necessity of reforming the point or removing it and supplying a new one to the tooth.

A further object of the invention is the provision of a detachable. and reversible point;

The present invention is an improvement on that shown anddescribed in my Reissue Letters Patent No. 12,608, dated February 12, 1907.

in the drawings accompanying and formin part of'this specification, Figure 1 is e si e view of this improved two-partitooth attached-to an excavator shovel, which shovel is shown partly in section and broken away,

as is also a part of the tooth; Fig. 2 is a perspective view of the tooth portion or base of t is two-part tooth; and Fig. 3 is a perspective view of the point.

Similar characters of reference indicate corresponding parts'throughout the different figuresof the drawings. I

This two-part tooth comprises a tooth or body portion or base 2 and a detachable and reversible point 3. p The tooth is recessed to form a pair of shanks or jaws 4 and 5, one of which, as for instance the upper, is usually longer than the other and which jaws are bolted to the bucket by suitable bolts 6, the forward edge or lip 7 of the bucket fitting snugly in said recess, being engaged by the I shaped point 3 is bifurcated to fOIIIYfi. pair of jaws 13 and 14 connected a webor rib 15 rigidly uniting the two jaws to each other, thereby preventin any tendency of the jaws to spread an also preventing lateral movement-or play of the point relative to the tooth ortion or base. The end 16 of the Web w ieh is toward the rear of the point may conform, if desired, to the shape of the end wall of the recess between the lu s of the tooth, but in the present form oft e twopart tooth this is unnecessary, since the nose portion is formed at the base thereof with a pair of shoulders 17 and 18, with the shape of l which shoulders the inner ends 20 of the jaws of the point conform, the jaws terminating flush with the surfaces of the tooth. in the present instance these'shoulders and the in ner ends of the jaws of the point are curved, the shoulders being concave and the ends of the point convex, although this might be reversed if found desirable. By constructing the tWOr-Pillt tooth in this manner the point is interlocked with the tooth, being locked against transverse or lateral movement as well as vertical movement. The points are preferably made of steel castings, such for i stance as manganese steel castings, a number being preferably supplied with each shovel, and if desired the web of each point may be provided with an opening 19 to form a passage therethrough so that anyaccumulation of dirt or rust which would interfere with the proper fitting of the point on its tooth may be removed.

In practice the work which these teeth have to do wears away the oint, the major part of such wear being on t e undersides of the oints, so that their efficiency is gradually essened until they become unfit for use owing to the bluntness of the points. With two-part teeth it has been the usual practice when the oint has been worn into such a blunt con ition that it is not efiicient to do roper work, to remove the point and supply a new one. But by providing a reversile point the life,thereof is very materially prolonged, In ractice the point wears away in a somew at similar manner to that illustrated by dotted line (Ir-*0, Fig. 1, and in this blunt condition it will not .nroperly penetrate and do eflicient work. ut on reversing the point the sharp portion or penetrating end of the pointis brou ht into position to do its work properly. hus, the oint 4 may be considered as practically self s arpening, since after it is reversed, and again bein a practica le manner, must have its cutting or penetrating part when reversed in substantially the same plane as this part was in prior to its reversal, and to accomplish this it must have both of its jaws terminating in about the same position with relation to the nose of the tooth and must also have-each of its jaws engage the nose at about the same distance from the center line of such nose. This is accomplished by so locating the jaws with relation to a line, (see cc) intersecting the apex at the point and the junction point of the jaws that each jaw will have its free end at about the same distance from that line when continued through the nose of the tooth, and the nose of thetooth must be correspondingly so formed that when the point is reversed this point will have the same position with relation to the bucket or shovel lip and will always be in the same cutting plane,

with its thrust substantially in line with the lip or wall of the bucket to which the tooth is connected. In other words, the relation of the tapered nose of the tooth to the bucket lip must be such that the working end of the oint will be substantially in line' with such ll and therefore in the line of the strain, w ereby the liability of pulling off the point is prevented, and this is obtained by so locatin the nose that the end thereof is substantially in thesame plane as the bucket lip, while the working-end of the oint is not very materially above the plane 0 the underside of the tooth at the rear of its nose.

For the purpose of rigidly attaching the point to the nose, a bolt 21 is provided, shown passing through the point and the nose at an angle thereto, a nut 22 on one end located in a socket 23 of one of the jaws of the point clampin this bolt in position. The oint is provided with another pair of aline bolt 0 )enings 24 and 25, which on the reversal of t 'e point will communicate with the opening 26 passing through the nose for the reception of the bolt. n the present construction it will be noticed that the ends 2O of the jaws of the point extend to the rear of and passed the end wall 8 of the recess forming the tooth'jaws and therefore beyond or in rear of the point of engagement of the might be provided for securing the point to the nose nevertheless one bolt is suflicient to accomplish this purpose owing to this long engagement and also to the provision of the web connecting the jaws of the-point and the location thereof in the bifurcated end of the nose, and whereby also the shoulders which are formed by cutting away the metal may be located at a point where there is considerable stock, and this without the necessity of form ng an enlargement or bulging nose.

This im rovedpoint and its carrying member or b0( y portion are so made, orcast as hereinbefore set forth, that the point ;can be assembled with either side up, the point thus being constructed as a reversible point, so that such point is reversible not only after it has become worn into that condition, but is reversible prior to. any wear thereon. i. This avoids the necessity of its always being attached to the nose of the body in one particular manner to enable it to properly do its work. Since the point can be attached, because of its mode of construction, with either side up, as both outer sides are inclined and in the preferred construction have the same for iatlon or inclination, it follows that the present improved oint is reversible in the roadest sen'se of t at term, since, as stated, before it has becomeworn at all it is reversible, so that it may be considered as a preformed or reversibly constructed point, that is, one constructed or formed reversible at the time of its manufacture and before it is attached to the nose, thus ermitting it, as stated, to be attached with either side up.

I claim as my invention:

1. A tooth of the class described, comprising a tooth or body portion havin a palrof jaws and provided with a forward y extending nose comprising lugs spaced apart, and a detachable and reversible point having a web shorter than said tween said lugs. I i

2. A tooth having a forwardly projecting recessed nose, and a detachable and reversible point bifurcated to form a pair of jaws embracing said nose, .said jaws being united by a web shorter than one of said jaws and projecting into within said recess.

, 3. A tooth having a body ortion recessed to form a pair of parallelly located jaws ada ted to embrace and extend rearwardly of t e edge of a shovel, and a detachable and reversible point bifurcated to form a pairof jaws of substantially the same length adapted to embrace the nose of the tooth.

' 4. A detachable and. reversible, wedge shaped point having at both sides to the apex thereof the same inclination. j

5. A detachable and reversible, bifurcated, wedge-shaped point having at both sides to the a ex thereof the same inclination.

6. tooth comprising a recessed body having a forwardly extended nose recessed to jaws and projecting beform a pair of tapered lugs spaced apart, and l point attachable to said nose, said nose and a detachable an reversible point comprising a pair of-jaw's embracing the nose and having a Web uniting said jaws and located within the recessof said nose, the free ends of said j aws terminating in the rear of the front wall of the recess of said body. v

7. The combination of a tooth comprising a recessed body having a nose divided by a recess into a pair of lugs, and a detachable and reversible point having jaws embracing said lugs and connected by a vertical web having an o ening therethrough to facilitate the remova of foreign matter between the jaws.

8. point bifurcated to form a'pair of jaws and made or cast to have the same inclination at both sides of a line intersecting the apex and the uncture points of said aws.

9. A two-part tooth of the class specified, comprising a tooth portion having means for attachment to a shovel or bucket and provided with a noseportion projecting for-- 10. A two-part tooth of the class specified,

comprising a tooth portion having means for attachment to a shovel or bucket and provided with a nose portion projecting forwardly therefrom, and a detachable and reversible point having two sets of alined, angularly located bolt openings located in in-. tersecting planes, each set located to communicate with a single bolt opening extending through the nose.

11. A two-part shovel tooth comprising a body portion having means for attachment to a shovel or bucket and provided with a forwardly extending nose, and a reversible point attachable to said nose, said nose and point so constructed that working end of the'point will be substantially in line with the lip of the bucket.

12. A two-part shovel tooth, comprising a body portion having means for attachment to a shovelor bucket lip and provided with a forwardly extended tapered nose, and a bifurcated point attachable to said nose, said nose and point being so located with relation to the bucket lip that a liine passing through the apices of said point and nose will strike said 11p.

13. A detachable and reversible wedge shaped point tbifurcated to form a pair of jaws united b a Web and made or cast with substantially the same inclination at both sides of a line intersecting the apex and the juncture points of said jaws.

14. A two-part shovel tooth, comprising a body portion having means for attachment to a shovel or bucket and provided with a forwardly extended nose, and a bifurcated A detachable and reversible tapered point having substantially the same amount of metal located at each side of a line intersecting the apices of the nose and point whereby the point is reversible and said nose having a pair of alined shoulders against which the ends of the point jaws engage.

15. A shovel tooth having a recess for the reception of a shovel or bucket lip and provided with a forwardly extended nose made or cast with substantially the same amount of metal located at each side of a line intersecting the apex of the nose and the front wall .of said recess, whereby it is adapted for the reception of a reversible point.

16. A twoart shovel tooth comprising a body portion having means for attachment to a shovel or bucket and provided with a forwardly extending nose, and a reversible tapered point made or cast with both sides inclined alike to the apexthereof.

17. A detachable and reversible wedgeshaped point bifurcated to form a pair of jaws of substantially the same length and having a web of less length than and uniting said aws.

18. A detachable and reversible point bifurcated to form a pair of jaws of substantially the same length, and an integral web uniting said jaws, said web having an opening for the passage of a cleaning tool 19. A shovel tooth having means for attachment to a shovel or bucket and provided with a forwardly extending tapered nose, and a tapered reversible point made or cast with the same amount of stock at each side of a line intersectin the apex of the nose and point.

20. Ina tooth of the class specified, the combination with a carrying member, of a reversibly made or cast point attachable, when first applied to properly work with either side up. 4

21. In a tooth of theclass specified, the combinatioh with a carrying member, of a reversibly made or cast point-comprising a pair of web-connected jaws and attachable, when first applied to properly work, with either side up.

22. A detachable and reversible point,

comprising an approximately wedge'shap'ed of the front Wall of the recess of said body.

24. A shovel tooth, comprising a body portion having a recess, and a tapering nose portion projecting forwardly from such body portion and terminating in a air of vertically alined shoulders located 1n the rear of the frontwall of the recess of said body. '5 25. A tooth of the class specified comprising a carryingmember-having means for attachment to a shovel or bucket, and a reversible point bifurcated to form a pair of web-connected jaws having both sides thereof inclined to its apex in the same angular plane.

26. A detachable and reversible point of the class specified having both sides thereof inclined to its apex in the same angular plane.

27. A shovel tooth having means for attachment to a shovel or bucket and provided with a forwardly extended nose having substantially the same amount of metal located at each side of a line intersecting the the reception of a reversible point, and bifursaid nose terminating in a pair of shou ders point engage. i 28. A shovel tooth having a recessed portion for the reception of a shovel or bucket lip and providedwith a forwardly extended nose having substantially the same amount ofmetal located at each side of a line inter jsectin the apex of the nose and terminating at sai recess, whereby it is adapted for the reception of a reversible point and bifurcated to form a pair of lugs spaced a art, said nose '35 terminating in a pair of shouh ers located in the rear of the front wall of said recess.

- 29. A two-part tooth of the class specified comprising a tooth portion having-means for attachment to a shovel or bucket and pro- 40 vided with a recessed nose portion, and a reversible point attachable thereto and having web-connected jaws engaging said tooth along their inner'ends. i

30. A two-part tooth of the class specified comprising a tooth portion having means for attachment to a shovel or bucket and provided with a recessed nose portion, and a reversible point attachable thereto and havingweb-connected jaws, the web projecting into said recess and engaging the inner or rear wall of said recess.

31. The combination, of a tooth having a forwardly extended nose recess, and a detachable an( reversible point bifurcated to embrace the nose and having a centrally located web fitting snugly within said recess. and engaging the inner or rear wall thereof whereby the point and the nose are interlocked one with the other. I 60 32. A tooth having a forwardly extended bracing the nose and enga'gmg said shoulders apex of the nose, whereby it isadapted for with which the inner ends of the'jaws of the.

rovided with a nose comprising a pair of tapered lugs spaced apart, said nose terminating at its rear-in a air of shoulders extendin substantially the ull Width of said nose, an a detachable and reversible point havinga air of jaws emand connected by a web projecting into the, space between the lugs of the nose.

33. A detachable and reversible point having a pair of jaws connected by a web shorter than said jaws. I

34. A detachable and reversible point having a pair of jaws connected by a web shorter than one of said jaws. g

"35. A two-part tooth of the class specified, comprising a tooth portion having means for attachment to a shovel or bucket and pro vided with a nose portion 'pro'ecting forwardly therefrom, and a point aving two sets of alined bolt. 0 enings, each set located to communicate wit a bolt opening extending through the. nose.

36. A two-part tooth of the class specified, comprising a tooth portion having means for attachment to a shovel or bucket and provided with a nose portion projecting forwardly therefrom, and a reversible point having two sets of alined, angularly located bolt openings located in intersecting planes, each set located to communicate with a single bolt opening extending through the nose. 1

37, A shovel tooth having a projecting recessed nose, and a recessed body having a air of-shoulders located in the rear of the :front wall of the recess of said body.

38. A detachable and reversible'point having the top and bottom sides thereof inclined .to the apex. I

39. A detachable and reversible point 100 comprising a pair of web-connected jawshaving the top and bottom sides thereof inclined, each in a single angular plane.

' 40. A tooth com rising a carrying member and a detachal ile and reversiblepoint comprising a pair of web-connected jaws having the top and bottom sides thereof inclined, each in a single angular plane.

41. A tooth comprising a' carrying member having a forwardly extending, tapered'and bifurcated nose, and a tapered and reversible point comprising a pair of web-connected aws having the top and bottom sides thereof inclined to a horizontal plane and with the bottom side inclined upwardly toward the point.

FRANK J. THOMAS. Witnesses:

C. B. CAMERON, ROY S. OVELMAN 

